Typically siding shears use air.
How to cut cement board siding.
Mark where you d like to cut the board.
Wait for the saw blade to warm up and come to full rpm before.
The easiest method to cut the hardie board is that you spot the surface and break the sheet along the marked line.
This is the same way of cutting the drywall.
Make sure the line is straight and visible.
In fact you could use a utility knife or a carbide tipped scoring equipment in order to spot the line.
Cutting fiber cement siding siding shears.
You can use diamond cutting blades attached to your circular saw or sliding miter saw.
For a slow but virtually dustless way to cut siding use power.
The cleanest way to cut fiber cement siding is by using siding shears.
With the cement board flat use a ruler to guide your pencil as you mark a line where you want to cut the board.
You may need to trace over the line a few times to leave a mark that you can see well.
Lay your cement board out on a work table or between two saw horses.
When cutting fiber cement siding with circular saw use a blade that has only four or six teeth.
To keep dust to a minimum use a circular saw that s equipped with either a dust collection bag or electric fan that.
Like the score and snap method set a straightedge across your sheet.